Probably, although Martin was definitely not the first fantasy author to put a villainous faction/entity in the inhospitable frozen north, nor was he the first to have a villain with a zombie army.

Although I think the Mountains of Muscles are more likely just a border feature slapped in between the Necrolord and the ambiguous barbarians of the northern steppes, which are again a common trope but probably directly drawn from the barbarian tribes of Icewind Dale (Wulfgar's people in Forgotten Realms).

[–] _m_cubed_@lemmy.world 1 points 5 months ago* (last edited 5 months ago)

I believe op is referring to Bakshi’s Fire and Ice, not martin’s books. The rest of your point still stands though.